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<div class="section" id="next-command">
<span id="index-0"></span><h1>next command<a class="headerlink" href="#next-command" title="Permalink to this headline">¶</a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre>next variables
</pre></div>
</div>
<ul class="simple">
<li>variables = one or more variable names</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre>next x
next a t x myTemp
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p>This command is used with variables defined by the
<a class="reference internal" href="variable.html"><em>variable</em></a> command. It assigns the next value to the
variable from the list of values defined for that variable by the
<a class="reference internal" href="variable.html"><em>variable</em></a> command. Thus when that variable is
subsequently substituted for in an input script command, the new value
is used.</p>
<p>See the <a class="reference internal" href="variable.html"><em>variable</em></a> command for info on how to define and
use different kinds of variables in LIGGGHTS(R)-PUBLIC input scripts. If a
variable name is a single lower-case character from “a” to “z”, it can
be used in an input script command as $a or $z. If it is multiple
letters, it can be used as ${myTemp}.</p>
<p>If multiple variables are used as arguments to the <em>next</em> command,
then all must be of the same variable style: <em>index</em>, <em>loop</em>, <em>file</em>,
<em>universe</em>, or <em>uloop</em>. An exception is that <em>universe</em>- and
<em>uloop</em>-style variables can be mixed in the same <em>next</em> command.</p>
<p>All the variables specified with the next command are incremented by
one value from their respective list of values. A <em>file</em>-style
variable reads the next line from its associated file. An
<em>atomfile</em>-style variable reads the next set of lines (one per atom)
from its associated file. <em>String-</em> or <em>atom</em>- or <em>equal</em>- or
<em>world</em>-style variables cannot be used with the the next command,
since they only store a single value.</p>
<p>When any of the variables in the next command has no more values, a
flag is set that causes the input script to skip the next
<a class="reference internal" href="jump.html"><em>jump</em></a> command encountered. This enables a loop containing
a next command to exit. As explained in the <a class="reference internal" href="variable.html"><em>variable</em></a>
command, the variable that has exhausted its values is also deleted.
This allows it to be used and re-defined later in the input script.
<em>File</em>-style and <em>atomfile</em>-style variables are exhausted when the
end-of-file is reached.</p>
<p>When the next command is used with <em>index</em>- or <em>loop</em>-style variables,
the next value is assigned to the variable for all processors. When
the next command is used with <em>file</em>-style variables, the next line is
read from its file and the string assigned to the variable. When the
next command is used with <em>atomfile</em>-style variables, the next set of
per-atom values is read from its file and assigned to the variable.
When the next command is used with <em>universe</em>- or <em>uloop</em>-style
variables, the next value is assigned to whichever processor partition
executes the command first. All processors in the partition are
assigned the same value. Running LIGGGHTS(R)-PUBLIC on multiple partitions of
processors via the “-partition” command-line switch is described in
<span class="xref std std-ref">this section</span> of the manual. <em>Universe</em>-
and <em>uloop</em>-style variables are incremented using the files
“tmp.lammps.variable” and “tmp.lammps.variable.lock” which you will
see in your directory during such a LIGGGHTS(R)-PUBLIC run.</p>
<p>Here is an example of running a series of simulations using the next
command with an <em>index</em>-style variable. If this input script is named
in.polymer, 8 simulations would be run using data files from
directories run1 thru run8.</p>
<div class="highlight-python"><div class="highlight"><pre>variable d index run1 run2 run3 run4 run5 run6 run7 run8
shell cd $d
read_data data.polymer
run 10000
shell cd ..
clear
next d
jump in.polymer
</pre></div>
</div>
<p>If the variable “d” were of style <em>universe</em>, and the same in.polymer
input script were run on 3 partitions of processors, then the first 3
simulations would begin, one on each set of processors. Whichever
partition finished first, it would assign variable “d” the 4th value
and run another simulation, and so forth until all 8 simulations were
finished.</p>
<p>Jump and next commands can also be nested to enable multi-level loops.
For example, this script will run 15 simulations in a double loop.</p>
<div class="highlight-python"><div class="highlight"><pre>variable i loop 3
variable j loop 5
clear
...
read_data data.polymer.$i$j
print Running simulation $i.$j
run 10000
next j
jump in.script
next i
jump in.script
</pre></div>
</div>
<p>Here is an example of a double loop which uses the <a class="reference internal" href="if.html"><em>if</em></a> and
<a class="reference internal" href="jump.html"><em>jump</em></a> commands to break out of the inner loop when a
condition is met, then continues iterating thru the outer loop.</p>
<div class="highlight-python"><div class="highlight"><pre>label loopa
variable a loop 5
label loopb
variable b loop 5
print "A,B = $a,$b"
run 10000
if $b > 2 then "jump in.script break"
next b
jump in.script loopb
label break
variable b delete
</pre></div>
</div>
<div class="highlight-python"><div class="highlight"><pre>next a
jump in.script loopa
</pre></div>
</div>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div>none</div></blockquote>
</div>
<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="jump.html"><em>jump</em></a>, <a class="reference internal" href="include.html"><em>include</em></a>, <a class="reference internal" href="shell.html"><em>shell</em></a>,
<a class="reference internal" href="variable.html"><em>variable</em></a>,</p>
<p><strong>Default:</strong> none</p>
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